Encyonema procerum | Species - Diatoms of North America

Category

Asymmetric Biraphid
Length Range

20.6-36.0 µm
Width Range

5.6-8.3 µm
Striae in 10 µm

8-11 dorsal; 11-13 ventral

Reported As

Encyonema droseraphilum (Bahls et al. 2013, p. 36, figs 3-10)

Contributor

Loren Bahls - Jun 2016
Reviewer

Sarah Spaulding - Jan 2019

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Identification

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Encyonema procerum Sem Wholevalve External

Description

Valves dorsiventral with narrowly rounded apices. Dorsal valve margin convex; ventral valve margin nearly flat and slightly tumid in the center. Length to width ratio 2.8–5.7. Axial area very narrow and confluent with a slightly wider central area. Proximal raphe ends are slightly inflated and deflected dorsally. Distal raphe ends are curved towards the ventral margin. Dorsal striae are radiate. A single indistinct stigmoid lies at the proximal end of the middle dorsal stria. Ventral striae are much shorter and parallel near the valve center, becoming convergent towards the apices. Areolae number 28–32 in 10 μm.

This species was described as E. droseraphilum in 2013 by Bahls et al., who were not aware that it had already been described and named by Krammer in 1997.

Autecology

Encyonema procerum has been collected from a floating mat fen and a shallow lake in the forested mountains of northwestern Montana (photos below). Both localities are rich in aquatic vegetation. On the date of collection, pH in the fen measured 6.77 and specific conductance measured 257 µS/cm.

Size Range, µm3

1001-10000
Motility

Slightly motile
Attachment

Tube-Forming
Habitat

Benthic
Colony

Colonies occasional
Waterbody

Inland
Learn more about this

Credit: John Pierce

Mud Lake, Bob Marshall Wilderness, Flathead National Forest, Montana.

Credit: Loren Bahls

Drosera Pond at Indian Meadows Research Natural Area, Helena National Forest, Montana.

Original Description

Basionym

Encyonema procerum
Author

Krammer 1997
Length Range

18-40 µm
Width

6.1-7.3 µm
Striae in 10µm

12-14

Original Images

Citations & Links

Citations

Cite This Page

Bahls, L. (2016). Encyonema procerum. In Diatoms of North America. Retrieved December 16, 2024, from https://diatoms.org/species/51643/encyonema_procerum

Responses

The 15 response plots show an environmental variable (x axis) against the relative abundance (y axis) of Encyonema procerum from all the stream reaches where it was present. Note that the relative abundance scale is the same on each plot. Explanation of each environmental variable and units are as follows:

ELEVATION = stream reach elevation (meters)
STRAHLER = distribution plot of the Strahler Stream Order
SLOPE = stream reach gradient (degrees)
W1_HALL = an index that is a measure of streamside (riparian) human activity that ranges from 0 - 10, with a value of 0 indicating of minimal disturbance to a value of 10 indicating severe disturbance.
PHSTVL = pH measured in a sealed syringe sample (pH units)
log_COND = log concentration of specific conductivity (µS/cm)
log_PTL = log concentration of total phosphorus (µg/L)
log_NO3 = log concentration of nitrate (µeq/L)
log_DOC = log concentration of dissolved organic carbon (mg/L)
log_SIO2 = log concentration of silicon (mg/L)
log_NA = log concentration of sodium (µeq/L)
log_HCO3 = log concentration of the bicarbonate ion (µeq/L)
EMBED = percent of the stream substrate that is embedded by sand and fine sediment
log_TURBIDITY = log of turbidity, a measure of cloudiness of water, in nephelometric turbidity units (NTU).
DISTOT = an index of total human disturbance in the watershed that ranges from 1 - 100, with a value of 0 indicating of minimal disturbance to a value of 100 indicating severe disturbance.